Site is http://www.getasite.in Alexa rank is 427,753 and PR1 site 1$ per month on top (size is 468*60) 10$ per year on top (size is 468*60) 1$ per month on left side or right side (size is 125*125) 10$ per year on left side or right side (size is 125*125) 2$ per month on center (size is 336*280) 15$ per year on center (size is 336*280)
Just to throw this out as a suggestion, one of my clients with a wpmu install uses http://projectwonderful.com for her advertising. She makes darn good money and they handle all of the behind the scenes work. Just a suggestion.